Manitowoc 999, Service And Maintenance Manual

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Reference
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Manitowoc
Published 05-16-17, Control # 233-03
8-1
999 SERVICE/MAINTENANCE MANUAL UNDER CARRIAGE
8
SECTION 8
UNDER CARRIAGE
TURNTABLE BEARING
Installation
The outer ring can be installed in any position with relation to
the carbody.
Two dowel pins are installed in the inner ring as shown in
Figure 8-1 , see View Y-Y to locate the position of the inner
ring on the rotating bed.
Torque Requirements
Lubrication
Before installing the turntable bearing bolts, lubricate the
threads of each bolt with "Never-Seez" or an equivalent anti-
seizing lubricant.
Torque Values
Torque each turntable bearing bolt to 2,100 ft-lb (2 848 Nm).
When new bolts are installed, torque the bolts in two steps:
first to 600 ft-lb (814 Nm) and then to 2,100 ft-lb (2 848 Nm).
Torque Sequence
Torque two bolts at a time in the numbered sequence given
in
Figure 8-1 .
Torque Intervals
INITIAL OPERATION: torque all bolts to the specified value
after the first 50 hours of operation.
YEARLY OR EVERY 2,000 HOURS OF OPERATION
(whichever comes first): torque all bolts to the specified
value.
Bolt Replacement
If, at the yearly inspection interval, one or more bolts are
found to be torqued to less than 1,680 ft-lb (2 278 Nm),
replace each loose bolt. Also replace the bolts and washers
on each side of each loose bolt.
If, at the yearly inspection interval, nine or more bolts in
either ring are found to be torqued to less than 1,680 ft-lb
(2 278 Nm), replace all of the bolts and washers for the
corresponding ring.
Replace all of the bolts and washers each time a new
turntable bearing is installed.
WARNING
Bolt Failure!
Loose or improperly torqued bolts can cause bolts or
turntable bearing to fail, possibly allowing rotating bed to
break away from carbody.